Self-incompatibility governed by a two-gene system is located in___________________?
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Answer: A. Gramineae
Explanation
Self-incompatibility systems governed by a two-gene interaction are famously located in the grass family Gramineae. These complex genetic mechanisms prevent self-fertilization, thereby promoting genetic diversity within grass populations. Interaction between multiple loci ensures that pollen carrying matching alleles fails to germinate on stigmatic tissues. Gramineae, also known as Poaceae, is a large and economically vital family of monocotyledonous flowering plants. Self-incompatibility in plants prevents inbreeding depression by rejecting self-pollen and encouraging outcrossing. Genetic control of breeding systems can be sporophytic or gametophytic depending on the specific plant family.
Plant breeders study these genetic systems to develop hybrid crop varieties in cereal grains and forage grasses. Understanding reproductive barriers helps agronomists manage seed production plots for commercial cereal crops efficiently. Maintaining genetic diversity within crop species ensures better resilience against evolving pests and diseases. Solanaceae family plants typically utilize single-locus gametophytic self-incompatibility systems rather than two-gene grass mechanisms. Cruciferae species generally exhibit a single-locus sporophytic self-incompatibility system governed by the S-locus. None of the above is incorrect because Gramineae is explicitly the correct family possessing this two-gene system.
- Subject
- Agriculture
- Category
- Agriculture
- Topic
- —
- Difficulty
- medium
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